Load ascertaining device



Nov. 7, 1933.- F. MILLER LOAD ASCERTA'INING DEVICE Filed Oct. 20, 1932 INVENTOR. Elan/MLl/ez' dv 7/ g?? H15 ATTORNEY.

Patented Nov. 7, 1933 UNITED STATES LOAD ASCEBTAININ G DEVICE Frank Miller, Easton, Pa., assigner to Ingersoll- Rand Company, Jersey City N. J., a corporation ol.' New Jersey Application October 20, 1932. Serial No. l638,67.

1 Claim. (Cl. 285-47) This invention relates to load ascertaining devices, and more particularly to a device of that character adapted to be interposed between a supporting and a supported element and serving 5 as a link to connect the two.

One object of the invention is to ascertain the weight of a suspended load through the instrumentality of a iluid column of which the pressure to which it is subjected may be readily indicated.

Another object is to assure against leakage of the uid from its container.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference characters refer to similar parts,

Figure 1 is a side elevation of a load ascertaining device constructed in accordance with the practice of the invention and showing it applied to a core drilling apparatus, the latter being shown partly in section,

Figure 2 is a sectional elevation of the device, and

Figure 3 is a sectional elevation taken through Figure 2 on the line 3 3.

Referring more particularly to the drawing, the load ascertaining device, designated in its supporting cable B and a supported element illustrated, in the present instance, as a core drilling apparatus C.

The apparatus C may include in its organization a core cutting bit D having a shaft E aillxed thereto for connecting the cutting bit with the motor F whereby the bit is rotated for cutting a hole G in the rock H. The motor F is arranged in a casing J on the lower end of a stem K the upper end of which stem is aflixed to the device A in a manner to be more fully described hereinafter.

The cable B may be secured to the device A in any well known manner and may be trained over a pulley or roller (not shown) but which may be located at the head of a derrick L spanning the hole G. The derrick L may also serve as a mounting for a hoist O whereby the cable is wound and unwound for raising and lowering the drilling apparatus.

Constructed in accordance with the practice of the invention the device A comprises a cylinder P having an integral imperforate lower head Q and an opening R at its upper end for the insertion of a piston S thereinto. A closure is -provided for the opening R in the form of a entirety by A, is shown interposed between a ldetachable head T having an aperture U to receive slidably a piston rod V.

The upper and lower ends W and X, respectively, of the piston rod are of reduced diameter, and at the junctures of these ends and the main *i0 body portion of the piston rod are shoulders Y and Z. The end X extends through the piston S and a screw b is threaded thereinto to afiix the rod V to the piston S and to maintain the shoulder Z seated rmly against the upper face of the piston S.

Disposed upon the reduced end W of the rod V is a cross-head c which seats upon the shoulder Y and is clamped thereto by a nut d threaded on the free end of the stem W. In the ends of the cross-head c are apertures e to accommodate rods f which depend from the cross-head c and seat with their heads g upon the cross-head. The rods l lie on diametrically opposite sides of the cylinder P and -extend through a cross-head h which is arranged beneath the cylinder P. The lower ends of the rods f are threaded to accommodate nuts i upon which the cross-head 'h may seat.

Preferably the rods f are suitably guided by the cylinder P as by extending the rods slidably 30 through apertures Ic in lugs o on opposite sides of the cylinder P. A connection is provided between the upper end of the stem K and the cross-head h by a clevis p which is connected to the stem K and a pin q of the clevis is seated in the cross-head h midway between the rods j.

In order to enable the cylinder P to be conveniently connected to the cable B said cylinder is provided near its top end and on opposite sides thereof with trunnions r upon which are mounted the ends of a bail s to which the cable B is secured. The hails is of V-shape and of such length that its angular portion overlies the cross-head c.

Within the cylinder P is a fluid t as for instance oil, and upon which the piston S rests, and at the lower end of the cylinder is a conduit u which is connected to a pressure gage v to indicate the weight of the load to which the fluid t is subjected.

In operation, whenever it is desired to ascertain the load or weight of the apparatus the same '00 may lbe suspended from the cable and its weight will then be indicated by the gage v. In the event that the total weight of the apparatus should be considered excessive, in view of the nature of the rock being drilled, the excess weight of the drill- 133 ing apparatus may be supported by the hoist 0, thus assuring a good drilling action of the cutting bit D.

' I claim:

A load ascertaining device forming a link be- 113 the cross-head, means on the cylinder for guiding the rods, a cross-head beneath the cylinder and being arranged on the rods to support the supported element, and means exposed to the pressure of the uid for indicating the weight of the load.

FRANK NIILLER. 

